[util] track the lifetime of strings passed through the StripString function family

Specialize StripString functions for the std::string_view and TStringBuf types.

An example of erroneous code in which the compiler will be able to detect a problem with the lifetime of temporary string:
```
TStringBuf sb = StripString(TStringBuf{"   abc   "s});
Use(sb);  // segfault
```
commit_hash:ad47648de30fd1a7e59d39a8ec3918fd1484a0ba

1 files changed, 22 insertions, 0 deletions

diff --git a/util/string/strip_ut.cpp b/util/string/strip_ut.cpp
index d5598ce866b..37e5a4f04a0 100644
--- a/util/string/strip_ut.cpp
+++ b/util/string/strip_ut.cpp
@@ -103,8 +103,20 @@ Y_UNIT_TEST_SUITE(TStripStringTest) {
                 StripStringLeft(TString(test.Str), EqualsStripAdapter('/')),
                 test.ResultLeft);
             UNIT_ASSERT_EQUAL(
+                StripStringLeft(TStringBuf(test.Str), EqualsStripAdapter('/')),
+                test.ResultLeft);
+            UNIT_ASSERT_EQUAL(
+                StripStringLeft(std::string_view(test.Str), EqualsStripAdapter('/')),
+                test.ResultLeft);
+            UNIT_ASSERT_EQUAL(
                 StripStringRight(TString(test.Str), EqualsStripAdapter('/')),
                 test.ResultRight);
+            UNIT_ASSERT_EQUAL(
+                StripStringRight(TStringBuf(test.Str), EqualsStripAdapter('/')),
+                test.ResultRight);
+            UNIT_ASSERT_EQUAL(
+                StripStringRight(std::string_view(test.Str), EqualsStripAdapter('/')),
+                test.ResultRight);
         };
     }
 
@@ -129,6 +141,16 @@ Y_UNIT_TEST_SUITE(TStripStringTest) {
             u"abc");
     }
 
+    Y_UNIT_TEST(TestSelfRefStringStrip) {
+        TStringBuf sb = "  abc ";
+        StripString(sb, sb);
+        UNIT_ASSERT_EQUAL(sb, "abc");
+
+        TString str = "  abc ";
+        StripString(str, str);
+        UNIT_ASSERT_EQUAL(str, "abc");
+    }
+
     Y_UNIT_TEST(TestCollapseUtf32) {
         TUtf32String s;
         Collapse(UTF8ToUTF32<true>("  123    456  "), s, IsWhitespace);